Big Brown's trainer Rick Dutrow Jr. gives his horses steroids every month, the New York Daily News reported.

"I give all my horses Winstrol on the 15th of every month," Dutrow told the Daily News. "If (the authorities) say I can't use it anymore, I won't."

Winstrol, a powerful steroid, is legal in 28 of the 38 U.S. states that feature horse racing, including the sites of the three Triple Crown races, Kentucky, Maryland and New York. The 10 other states allow four anabolic steroids, including Stanozolol (Winstrol's former name), to be used for therapeutic uses only, the newspaper reported.

An official at the Racing Medication and Testing Consortium told the Daily News that he expects all 38 states to adopt the steroid ban by the end of the year.

Questions about doping in horse racing surfaced after Eight Belles collapsed at the end of the Kentucky Derby. The filly was euthanized after suffering two broken ankles. Her trainer, Larry Jones, said Eight Belles was not on steroids and ordered drug tests to be done as part of her autopsy to put any rumors to rest. Results from the drug tests are still pending.

Big Brown, won recorded a decisive victory at the Kentucky Derby, is a 1-2 favorite entering Saturday's Preakness Stakes. He's trying to become the first horse since Affirmed in 1978 to win the Triple Crown.